Hydraulic hoist control



1934. I H. F. GORSUCH ET AL 3 L6 HYDRAULIC HOIST CONTROL Fil-ed Feb.1951 (1 H01 um:

Patented Aug. 28, 193 4 umrao s'rArss PATENT; OFFICE masonic nors'rcomer.

Howard F. Gorsnch and Philip Dnpre, Mansfield, Ohio Application February4, 1931, Serial No. 518,449

6 Claims. (Cl. 138-8) This invention is directed to control means forhydraulic motors, particularly where such motors are used as a means foroperating dump bodies or for like operations.

In the use of hydraulic motors for operating dump bodies, such motorsare supported on the chassis o! the vehicle as a general arrangement,and the control means therei'or is located adjacent the driver's seat,to provide for full control 01' the motor and accurate government and0peratlon oi the dump body. Such hydraulic motors usually include a pumpto be driven tor the power circulation of the motive fluid, and a valvehaving several operative positions: one to permit circulation of themotive fluid for power purposes in and during the operation of the pump;a second, wherein the circulation is arrested and in tact prevented, forholding the motor in any desired operated position; and a third, duringwhich provision is made for Iree I reverse circulation of the motivefluid, to permit the motor parts to return to normal positions. In thefirst position of the valve, the pump is in "operation, while in thesecond and third posivolves means for connecting the motor shaft foractuation, and means for arranging the valve in the selected'position.These controls have heretoiore been provided in the use of twoindependent levers, one Ior the pump operation and the other for thevalve control. The use of two levers mrzes tor contusion in operation,and obviously tends to a liability or improper operation and consequentdamage.

The essential feature of the present invention is the provision of acontrol means for such hydraulic motors, involving a single lever,capable of being moved to a plurality of positions, and controlling theoperation of the pump-shaft and of the valve simultaneously, thepump-shaft control being capable of selective combination with the leverat will, thus permitting a single lever being operated to set the pumpin operation and open the valve to permit power circulation or themotive fluid; interrupt the operation oi! the pump and move the valve toa position to prevent motive fluid circulation, and thus hold the partsin any desired position of rest; or to interrupt the pump operation andmove the valve to permit a reverse circulation of the motive fluid, tothus permit motor parts, and connected elements to return to normalpositions.

The provision of a single lever avoids possibility of confusion inoperation, insures accuracy of control, and makes for emciency andcertainty under all conditions.

The invention will be described in connection with the accompanyingdrawing, in which:

Fig. l is a side view, illustrating the singleiever control, thehydraulic motor being shown in outline, and a portion only of thevehicle being shown.

Fig. 2 is a horizontal sectional view through the powertake-ofl.

Fig. 3 isa rear elevation of the operating lever.

Fig. 4 is an enlarged broken view, showing the lever and connected partsin each of its. several positions. The hydraulic motor control or thisinvention, as illustrated, includes a single lever provided with alink-control bar, which bar is aclectively operated to govern theoperative connection or the lever with the power take-oi! for theoperation 01' the motor pump, the lever proper being connected with thecontrol valve for the motor for operation of such valve in all movementsor the lever. Thus the lever, through the selective operation of thelink-control rod, may be made to connect the power take ofl, for

the operation of the pump and simultaneously set the valve, or controlthe setting of the valve independently of the power take 011'connection.

In the preferred form of detail, the invention includes a lever 1,preferably iulcrumedat 2, on a fulcrum-rod removably secured to a casing3, forming an offset from the usual vehicle transmission 4. A pump shaft5, leads from the easing 3, and within the latter is provided with asliding gear 6, capable of being moved into or out of mesh with anappropriate motor-driven gear 7 or such transmission, to thereby operatethe'pump shalt at will.

The gear 6, which is of course held against other than a slidingmovement on the pump shalt, is provided with the usual annular channels8 to receive yoke arms 9, extendingirom a stub shaft 10, slidable in thecasing 3, and extending beyond such casing, as at 11. Obviously, slidingmovement of the shaft 10, will move the gear 6 into and out of mesh withthe motor driven gear 7, and thus control the operation of the pumpshaft, and thereby the pump of the hydraulic motor.

The lever 1 is formed with an enlargement in which is provided alongitudinally-ranging slot 12. A link 13 is pivotally connected to theprojecting end of the shaft 10, and passes loosely 7 through the slot12. That portion of the link passing through the slot is reduced invertical dimensions to provide a shoulder 14, and the free terminal ofthe reduced portion beyond the lever is laterally thickened, as at 15,to provide for connection with the link-control lever, and to constitutea stop for engagement by the lever 1 in movement in one direction. A pinor bolt 16 is passed through the lever, bridging the slot 12, anddesigned to cooperate with the shoulder 14 of the link 13 in themovement of the lever in a direction opposite that serving to engage thestop 15.

A control rod 1'7 is loosely connected to the stop 15, and extendsvertically of the lever 1, being connected adjacent the handle of suchlever to a finger-lever control plate 18, pivotally supported on thelever 1, and having a finger extension 19, convenient to the fingers ofthe hand grasping the handle of the lever 1.

The improved lever control is to be used in connection with anyhydraulic hoist involving a hydraulic motor having a pump for the powercirculation of the motive fluid, and a valve for controlling suchcirculation. These details, not being important in connection with thepresent invention, require no illustration herein, and such motor isindicated in outline at 20, the valve operating connection beingindicated at 21.

A reach rod 22 is connected to the lower end of the lever 1, and to thevalve operating connection 21, so that in each movement of the lever 1the valve is operated. Of course it is to be understood that thepump-shaft, or other motor pump drive and also the reach rod and valveconnection are designed to be particularly arranged or made up so as toaccurately accommodate themselves to the particular type of pump andvalve and the particular arrangement and location of the hydraulic motorwith which the improved control may be employed. Thus under certainconditions, it may be desirable to reverse the function of the reach rodfrom that shown, wherein the fulcrum of the lever, now shown at 2, maybe disposed at the lower end of the lever and the reach rod connected tothe lever above such fulcrum. The details of the arrangement beyond thelever are not material, so long as provision is made for driving thepump and operating the valve.

In the arrangement described and shown, when the lever 1 is moved intothe position indicated at A in Fig. 4, the stub shaft 10 is movedthrough engagement of the lever and stop 15 to cause engagement of thesliding gear 6 with the transmission gear 7, and the pump of thehydraulic motor 20 is set in operation. At the same time,

the movement of the lever 1 has, through the this movement, the pin 16of the lever engages the shoulder 14 of the link 13, and; moves the stubshaft 10 to disengage the gears 6 and 7. The pump is thus cut ofl fromits power, and the reach rod has moved the valve to a position to cutoff circulation in the hydraulic motor, and the parts of the motor, andof the operated element are held at rest. That is, if a dump body isbeing operated, the dump body is held against further movement, and itis of course apparent that this holding of the dump body may take placeat any position of such body, either fully raised or at any intermediatestage. However, when returning the parts to normal positions, that is inthe case of a dump body, lowering such body onto the frame, it isnecessary to again operate the valve to a new position, one permitting avery open reverse circulation of the motive fluid, and this of course,without operating the pump. The lever, to secure this result is movedinto position C of Fig. 4, causing the reach rod to properly set thevalve. As the gear 6 should not be moved during this lever movement, thefinger extension is operated simultaneously with the movement of thelever, with the effect to cause the link-control rod 18 to raise theline 13, until theshoulder 14 thereof clears the pin 16. The movement ofthe lever l to the new position C thus does not affect the power drivein any particular.

The improved construction provides a single lever for all necessarycontrols of the hoist. There is no possibility of any confusion eitherin use or control where but a single lever is provided, and thusefliciency and certainty of operation and control is assured. The leveris preferably arranged immediately adjacent the drivers seat, so that,with thknowledge that but a single lever hasto be manipulated, and thislever convenient to his reach, there is little likelihood that errorwill arise in either the proper or desired operation.

While primarily designed for the control of hydraulic motors for.operation of dump bodies, it

is apparent that the invention is equally applicable to hydraulic hoistsof all types and for all purposes, where a pump for the motive fluid anda valve for the control of the circulation of this fluid is a necessarypart of the operating mechanism.

Having thus described the invention, what is claimed as new, is:-

1. A hydraulic hoist control for use with hoists of the type including amotor, a pump, and a valve, including a single lever capable of threeoperative positions, valve-control connections operative in each of saidthree lever positions, pumpcontrol connections interconnected with thelever in two such lever positions, and manuallyoperable means forrelieving the pump-control connections from lever influence in levermovement to such third position.

2. A hydraulic hoist control for use with hoists of the type including apump and a control valve, including a lever movable to any one of threeoperative positions, pump-control connections interconnected with thelever and responsive to movement of the lever to either of two of suchthree operative positions, manually operative means for moving suchpump-control connections beyond lever influence during movement of thelever to the third of such positions, and valvecontrol connectionsresponsive to lever movement in each of said three positions.

3. A lever for the control of a pump and valve of a hydraulic hoist,said lever being mounted for movement to any one of three positions,pump-control connections interconnected with the lever, manuallyoperable means for selective control of such connections during movementof the lever to two of such three positions, said means permittingmovement of the lever to the third position without influence on saidconnections, and valve-control connections operative by the lever inlever movement to each of said three positions.

4. A lever for the control of a pump and valve of a hydraulic hoist,said lever being mounted {or movement to any one oi three operativepositions,

pump-control connections, valve control connections. said Dump-controlconnections being interconnected with the lever and responsive to levermovement during movement of such lever to two such operative positions,means for adjusting said pump-control connections time of leverinfluence during movement of said lever to the third operative position,and means ior operating said valve-control connections during movementof the lever to each of said three operative positions.

5. A lever for the control of a pump and valve of a hydraulic hoist,said lever being mounted for movement to am one of three operativepositions, valve-control connections responsive to lever influence ineach of said three positions of the lever, pump-control connectionsinterconnected with the lever and responsive to lever influence inmovement of such lever to two of such three positions, and a manuallyoperable element for shifting such pump-control connections beyondinfluence oi the lever during movement oi such lever to the thirdoperative position.

6. A control lever mounted for movement to any one of three operativepositions, a reach-rod control element connected to the lever andresponsive to lever movement to each of said three operative positions,a power-take-ofl connection cooperating with the lever, and means forselectively operating said take-oil connection relative to the lever tointerconnect said lever and takeoiT connection to cause the lever tooperate said take-oil connection during lever movement to two of suchoperative positions and freeing such takeofi connection from leverinfluence during movement of the lever to the third such operativeposition.

HOWARD F. GORSUCH. PHILIP DUPRE.

